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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31544e087a970d53e0c2d4c34ae34b417a2547a72f1dcff159b22ca28a1b3a1b' 
  AND token = 'vCZzlHwhzfe8lVavxtkOhxyYC3gs5ZHigZIJHpkU11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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