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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc1569f7dd0ae38024af2f128fd7a8895fe40ebcba8b7fdc0266127f138f88b' 
  AND token = '8jRgqkeFaQH6HwiJcOWEp2Blzn7JLVzlmBd5BkpOaPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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