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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4318b6ae6e18ee153010c5ed6adf193abd612da97012f6c822be1615cc5e8a56' 
  AND token = 'M+boCK4dI5rFKRXTPTaxSq+egTuKx8C5RUfpgdEnoL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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