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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c74d4c8962ba29e3eac24cd8322c94a75906ad9e43baf47edf1ddfdd1ab2e5a' 
  AND token = 'oNWs/3pUFVo7srrYcaEMd2Nu7N01pigMMHUEWEYDtw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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