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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb595f83f59e56f661485d16c2bfebe6c5fa3b69875758a89e467c943834ede' 
  AND token = 'yJkzlmF4QuzMUCCZEu88pJER4WyKZLD23Jg3Owr0n2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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