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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc4a887a6e0cddb2ac925fe46277068cb1bd2d80ef4d17102f3c2f5cc486fba' 
  AND token = 'OwsIo3IGHCoaQDM7I4xxaLAbWmuDG5iywC0daIEeXFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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