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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a0e353d69885ccfe6f3faf0c393d85251821a0f7caddfcab284a8f1a3c38a7' 
  AND token = '3hCCX9erv/fkBHXnvYfEJZQqrSqei5EUuEsXaA5HRQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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