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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182c392a4e73fdb8e3b892e233137460b0b849478af10f431e343f78457177b6' 
  AND token = 'NHDmm8bMFvTzRnMudmQ+kHAqU+7rgZt10nEesyzA68k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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