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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58afb675e88810bec2f9b1f452a56be1bf951d50028b77ae1973500f210effc' 
  AND token = '/ZeWI9WwE19eG+jKkouz0Xjt9/0OkBWjyZNGFmQ5aYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}