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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b1fcdb45f9f7ef6a9b9431292101f7e0de550b77ee1786e8e6fd9fde0046b7' 
  AND token = 'BPoLDiPLUqF/I53Mn72wzqdpE+dHq2OJNZ4eJ8se0DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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