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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79989988dbab2a1315659698180acb4ea178b7f4f14a2c56589f447015653beb' 
  AND token = '5pgg2hPvz39Qs037Yt9s1Y7z8qpmw0vybJSU+AdIDTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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