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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493a9b2452465eedfd8c432ac2115512dc09fce5a1bec64b3761b01873f9c9d6' 
  AND token = 'qaB4KD2muJSyMd8z9jJYw3VUmoua8DEv7tRSkWzysVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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