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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e80af524d8a41c7746cea2e1b8e500f79ef4a5957f53b54250eb732544fc31' 
  AND token = 'QY+uBXZXn5klksHx+Pfsk8+aP923FOr+nwrm1PG7HI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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