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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc5add27bb3f746e59c6fdb931af5dfd73cdea0d09dc5b25ff3b6a95855aa76' 
  AND token = '7FAZRrfWRZ787nWRZz+9vgCJz1GhdNk9xCMEL7+TKcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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