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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90324a592d691af5774730439b0416763a9816f779b2fffa21996a3e43cc5744' 
  AND token = 'SN5OyyMa/9EKtMXRlSSVZRhBx12FR7TDMR4SaWQpMYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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