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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39064fa9f670d7428899eefb02ffbeaf3c9de08f15677ff2e12c26555a309580' 
  AND token = 'LSH7BFCFe1MR1l6/IkD0yf25UtcxufBgmjmq3TFFTPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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