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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7125fae14c7313ab2dd62bd22d198c0e85c17724a24a105ecf94abca27841657' 
  AND token = 'NxzHwe5HRn3RDjY23k3de2I88m6ST4PJ2muEbb9p29Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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