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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdd51ba4530e338c6b053a3e8c24b8c62acdb10c0b33f4cee4f5c7a9ecbc315' 
  AND token = 'caOAvnceivsUxa4x7RSrSzcIrJqYeZRQ9cPLJHxYn/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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