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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fb3e66d311393d742dc06bd58165540a617fb8e5e0afd15db521059b6f52eb' 
  AND token = 'nvhFV8TCJxBTkmAB0f1adDJnWKlcas4Bj3ZsiOtXOKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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