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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1863aa5b8064b0e6d4f6e8006ae21e8d64ac5a7f5325d8194f5a2bd9b94d74aa' 
  AND token = 'x3wc+t6/56X8BOsgp+6RVFHjUScDEzxFONUNcUjEUOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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