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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c79db0490acbf8c1f9182f11602f63850d2cb1da640feb5789a0840e1b3f4c4' 
  AND token = 'j6M2M7P4CbcNzCxXj/BhCnfITc3VjNQcOVq0FAwU78k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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