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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1371d7aae381c52cc2061bc131719d2b841deeccd170de7c8871037fa6388c96' 
  AND token = 'J+r4adbOH5vsKELuVj90IqWqTWaLY1MwNBTqRQIUoBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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