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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c37cfd1a04ec1cb0ad743c42b390d5e7c653c916cd547f47a72c66bd1a3b25' 
  AND token = 'SvMO6fXY5vOfBVPnyQDSyadgAQfGu7FZuNuoHEN/oZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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