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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7442153136cdb894677cb6afa9e0e367d4239e44e5e5de63ef22f582e42c27' 
  AND token = '5q+DK0Oc6naNP3dA3LBMoRHGgkmY3ks3Mam4DHY7xmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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