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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af265305d2faa73195f2d4dcd320ec8fa2510f90deb4cf7bf4861db9305919ef' 
  AND token = 'hgQXP42ONriAmmJCrMrKRR201hcQ2JfxPGhWVsUQ/oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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