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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2034babfd41b36b29481a5bb5746c4d55015cfd16f4d97e4ac74692b7eb46952' 
  AND token = 'povR7Z+JDcs+rN+DOiRRZg6T50fi/vxvAb/gjIljqDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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