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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3189ee164caf37f6ca9ea15fd1323399ea1987233360cd04969fbf7d4cd5669a' 
  AND token = '0hUp/YQ1XvgZBFOhRSNqsuE7XLZ2p/FaLUWBpQFM2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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