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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6817cd5992914d2f4b06ae800b1d44fe02b66c357aeeb196aa8b6d3ee439b872' 
  AND token = '7ef1VusMMCvWSWJRwJ5tYJZvaF7E7+QcSuoGoS9KFtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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