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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfda855d5c7c50ef376df682cdace4682f313b28c1dd11d1319f795b86785772' 
  AND token = '1tPX/xVla/iyTtfmdjEryaESyqOB/ykxNoTrN7LrFfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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