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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab4d677beca11bf508f7a7def1c864dda5d1f2b32d55464da52e9debe095828' 
  AND token = 'HbJEa2mQboL8UTURhrw3vOCxVOsfy0OR3vPY2pK8YbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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