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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe6449be051f358e6c7917baa917ad6d8da363c40c9cc78d30b638cc04d4c96' 
  AND token = 'WbIDUaRHhhGXDslFEx7k1sM5d/r3wzFeC4dsvZ8g+EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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