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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c129fb662eddc4dc02fbbfdccd54c7213e23e7d875a464f3acaf13f5d5d3ab27' 
  AND token = '1tYC09WD5SNAwfUWjtd48qXLJ2SsWsWBJoHk8FP9FOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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