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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420b1635febf00c483b2186df2ddb00686e11020d440fa677071104dacd872eb' 
  AND token = 'TSbdfcRAtvCItSLVgJG7aM2uW0addwcp5CYy5nvJUag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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