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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c08216dab45f1456ae659a99e581195100d876d6f6ba08eaf9215e9eda9d4d3' 
  AND token = '4g5ORIVT7HIAAKPxGFG7Po1LIRRVz8wMeEE5QnedNAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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