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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48155c7d831f313adc76e6e61da645a1e3b352eb45fb290841f2722c5cfc96a3' 
  AND token = 'RFhs0lSRC0F1G1QGF41GXftEyBO4zBDAz8ZGEuIqeaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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