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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b27d6e202a010cf1c37adbed54d01d6f3a4d00d4b39e4c986d17574f5045e9' 
  AND token = 'WKa01NfJfiELCXsEuTBZAMLC9cFH0llP/GaVL6cnyYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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