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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7c731fad038d27b05505e392c9e73e744266db8db97e907e0f7338fdf684a9' 
  AND token = 'TCMMY/LPfEP6s+JvmtuR0ssEQPRW1TjPjDk2JueJ0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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