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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318226680b2d34adcc19bd2a3f168075c48bfe5a85d55fcaf70bc087fa2e17ac' 
  AND token = 'vtVpz87oP14n6uw8Sft9zwvkAlXgUn0Q95jy6s2+/XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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